My line is like the one in the picture Todd sent. The tool works similar to
the vacuum plug in old Cryoprobe? (you first screw it, and then pull to open)?
Alvaro Herrera Ph.D.
NMR Center Director
Chemistry & Biochemistry Department
Auburn University
________________________________
> From: main_at_ammrl.groups.io on behalf of Todd Rappe via groups.io
> Sent: Thursday, July 31, 2025 2:18 PM
> To: main_at_ammrl.groups.io
> Subject: Re: [AMMRL] Helium Transfer Lines - Refreshing vacuum. #poll-notice
Replying to Bob:
Different transfer lines have different fittings. The tool I posted is for
the type of transfer line pictured below. For the ones with the KF fitting,
you can just remove the nut and clamp on to a vacuum line.
_____________________________________
Todd Rappe
Minnesota NMR Center <nmr.umn.edu>
612-625-9147 (office)
651-321-TODD (rings office and mobile)
612-624-8892 (magnet lab)
On Thu, Jul 31, 2025 at 1:38 PM Bob Berno via groups.io wrote:
Hmm.
I'm not sure that's the tool you mean.
That looks like the valve you connect to the magnet vacuum port, either when
you are installing the magnet, or if you have de-energized the magnet and
want to break vacuum.
On Thu, Jul 31, 2025 at 12:25 PM Alvaro Herrera via groups.io wrote:
Anyone has picture of those "pieces" I would like to see if we have some.
Thanks,
Alvaro Herrera Ph.D.
NMR Center Director
Chemistry & Biochemistry Department
Auburn University
________________________________
> From: main_at_ammrl.groups.io on behalf of Kenneth Sharp-Knott via groups.io
> Sent: Wednesday, July 30, 2025 11:26 AM
> To: main_at_ammrl.groups.io
> Subject: Re: [AMMRL] Helium Transfer Lines - Refreshing vacuum. #poll-notice
Just to follow-up... The reason I ask is the engineer mentioned that most people
wait far too long. By the time you see evidence of it having gone soft, you have
likely been losing quite a bit of helium due to excessive boiloff for some time.
Apparently most transfer lines also come with the necessary equipment to pump
it down. They were some of the bit and pieces lying around the lab that I
had no idea of the purpose.
--
Dr. Bob Berno Manager,
NMR Facility
McMaster University,
ABB-156 1280 Main St.
West Hamilton, ON L8S 4M1
T: 905-525-9140 x24158 or x24686
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Received on Fri Aug 01 2025 - 08:26:29 MST